Surveillance and analysis for food-borne pathogens in retailed foods in Shaanxi province,2002-2006

Objective To investigate the occurrence and distributing trends of food-borne pathogens in retailed foods,find out food with high risk.Methods According to the instruction of national surveillance network on food-borne disease and food pollution,2 772 food samples of eight kinds were collected from eight areas during a period from 2002 to 2006 to monintor and analyse the presence of Salmonella,Listeria monocytogenes,E.coli O157:H7,Campylobacter and Vibro parahaemolyticus.Results 765 strains of objective pathogens were detected with an overall positive rate 33.67%.Raw meat and aquatic products showed a high prevalence of 55.31%(536/969) and 43.50%(144/331) respectively,followed by cooked meat products 17.57%(71/404).All of 5 monitored food-borne pathogens were found.On average,Listeria monocytogenes,Salmonella had the mostly high positive rate(16.68% and 9.15% respectively) than other pathogens,E.coli O157:H7 was 0.66%;While in aquatic products,Vibro parahaemolyticus reached to 30.15%,in pork and poultry,Campylobacter was 14.81% and 26.07% respectively.Salmonella strains were serotyped into 11 serum groups or subgroups and 29 serotypes,including some new groups and types which had never been reported in Shaanxi province.Conclusion Through 5 years continuing active surveillance,the situation of contamination in daily consuming foods by food-borne pathogens had been revealed,high risk foods were found,and five food-borne pathogens' distributing trends in different foods were also known.